比如，一些投影准确地显示了区域，但是扭曲了距离或比例；其他投影保留了国家的外形但是代表的区域不对。
Some projections show areas accurately but distort distances or scales, for example; others preserve the shapes of countries but misrepresent their areas.
对投影方式及比例参数设定后，再利用矿区不同的测量已知点与手持GPS接收机测量点坐标进行对比。
Contract the coordinate between different known survey points in mining area and the survey points by GPS receiver after establish the projection mode and scale parameter.
提出了基于连续比例因子的梯度投影算法。
The gradient projection method based on continuous scale factor is presented.
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